So we got access to Sketchfab Animation Beta yesterday, and other than a problem when bones have the same name (which they said they'll be resolving soon) it seems to work pretty well! You can see the problem on the left claw of the t-rex.
Figured it wouldn't hurt to get a few more eyeballs on it in case there's other oddities I missed. Due to the size it can be kinda slow to load. Sketchfab is pretty amazing really... so big props to their continuing innovation.
[Sketchfab]4e60943dffba4e99b2f7461a4d74aa32[/Sketchfab]
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@Arturow - I don't think there's a way to do that in the sketchfab editor though, we'd have to like... create one as part of the model. Unless you know a sketchfab trick I don't!